Authenticate AD user group

I was that I could set up a WLAN to authenticate to a specific group of users on an AD server. Is that true and if so, how do I set that up? I only see where I can chose the AD server to authenticate to, but not a user group within the AD.

When authenticating a particular user at the AD the ZD will receive to which group it belongs. Then it's your job to setup the correct roles in the Configure :: Roles part, so that the ZD will know to which group to apply the user to.